arch/x86/kvm/mmu/tdp_mmu.c:533:9: sparse: sparse: cast removes address space '__rcu' of expression

From: kernel test robot
Date: Sat Feb 27 2021 - 18:50:19 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
commit: 08f07c800e9d35b59d0c8346333f189160bd67d4 KVM: x86/mmu: Flush TLBs after zap in TDP MMU PF handler
date: 3 weeks ago
config: x86_64-randconfig-s022-20210228 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.3-241-geaceeafa-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=08f07c800e9d35b59d0c8346333f189160bd67d4
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 08f07c800e9d35b59d0c8346333f189160bd67d4
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

"sparse warnings: (new ones prefixed by >>)"
arch/x86/kvm/mmu/tdp_mmu.c:459:49: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:459:49: sparse: expected unsigned long long [usertype] *pt
arch/x86/kvm/mmu/tdp_mmu.c:459:49: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:291:9: sparse: sparse: context imbalance in 'tdp_mmu_link_page' - different lock contexts for basic block
arch/x86/kvm/mmu/tdp_mmu.c:316:9: sparse: sparse: context imbalance in 'tdp_mmu_unlink_page' - different lock contexts for basic block
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: got unsigned long long [noderef] [usertype] __rcu *
>> arch/x86/kvm/mmu/tdp_mmu.c:533:9: sparse: sparse: cast removes address space '__rcu' of expression
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:487:40: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected unsigned long long [usertype] *root_pt @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: expected unsigned long long [usertype] *root_pt
arch/x86/kvm/mmu/tdp_mmu.c:654:51: sparse: got unsigned long long [noderef] [usertype] __rcu *
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt @@
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:560:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] root_pt

vim +/__rcu +533 arch/x86/kvm/mmu/tdp_mmu.c

509
510 static inline bool tdp_mmu_zap_spte_atomic(struct kvm *kvm,
511 struct tdp_iter *iter)
512 {
513 /*
514 * Freeze the SPTE by setting it to a special,
515 * non-present value. This will stop other threads from
516 * immediately installing a present entry in its place
517 * before the TLBs are flushed.
518 */
519 if (!tdp_mmu_set_spte_atomic(kvm, iter, REMOVED_SPTE))
520 return false;
521
522 kvm_flush_remote_tlbs_with_address(kvm, iter->gfn,
523 KVM_PAGES_PER_HPAGE(iter->level));
524
525 /*
526 * No other thread can overwrite the removed SPTE as they
527 * must either wait on the MMU lock or use
528 * tdp_mmu_set_spte_atomic which will not overrite the
529 * special removed SPTE value. No bookkeeping is needed
530 * here since the SPTE is going from non-present
531 * to non-present.
532 */
> 533 WRITE_ONCE(*iter->sptep, 0);
534
535 return true;
536 }
537

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
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Next message: Steven Rostedt: "Re: [PATCH 0/2] tracing: Detect unsafe dereferencing of pointers from trace events"
Previous message: kernel test robot: "kernel/sched/core.c:6854:20: warning: unused function 'balance_hotplug_wait'"
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